Isolated Buck–Boost DC/DC Converters Suitable for Wide Input-Voltage Range

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number5710987
Pages (from-to)2599-2613
Journal / PublicationIEEE Transactions on Power Electronics
Volume26
Issue number9
Publication statusPublished - Sept 2011
Externally publishedYes

Abstract

A family of isolated buck-boost dc/dc converter for wide input-voltage range is proposed in this paper, and the full-bridge (FB) boost converter, being one of the typical topologies, is analyzed. Due to the existence of the resonant inductor (including the leakage inductor), the FB-boost converter can only adopt the two-edge-modulation (TEM) scheme with the FB cell being leading-edge modulated and the boost cell being trailing-edge modulated to minimize the inductor current ripple over the input-voltage range, and a phase-shift-control-scheme-based TEM with the use of the market available controller IC such as UC3895 is proposed, which realizes phase-shifted control for the FB cell to achieve zero-voltage switching. In order to improve the reliability and efficiency of the FB-boost converter, a three-mode dual-frequency control scheme is proposed, in which the FB-boost converter operates in boost, FB-boost and FB modes in low, medium and high input voltage regions, respectively, and for which the expression of the inductor current ripple is derived in this paper. As the input voltage in the FB-boost mode is close to the output voltage, the inductor current ripple in this mode is much smaller than that in the other modes, and the switching frequency of the boost cell in this mode can be lowered to one-(2N+1)th of the preset switching frequency to reduce the switching loss, and hence, to improve the efficiency. A 250-500 V input, 360 V output, and 6 kW rated power prototype is fabricated to verify the effectiveness of the design and control method. The average efficiency over the input-voltage range is 96.5, and the highest efficiency attained is 97.2. © 2011 IEEE.

Research Area(s)

  • inductor current ripple, Isolated buck-boost converter, pulsewidth modulation (PWM), two-edge modulation (TEM)

Citation Format(s)

Isolated Buck–Boost DC/DC Converters Suitable for Wide Input-Voltage Range. / Yao, Chuan; Ruan, Xinbo; Wang, Xuehua et al.
In: IEEE Transactions on Power Electronics, Vol. 26, No. 9, 5710987, 09.2011, p. 2599-2613.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review